2022 Fiscal Year Research-status Report
キレート剤による岩石/廃棄物からの金属抽出とCO2利用・鉱物化プロセスの開発
| Project/Area Number |
21K14571
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| Research Institution | Tohoku University |
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Principal Investigator |
WANG JIAJIE 東北大学, 環境科学研究科, 助教 (60875467)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | CO2 mineralziation / Chelating agent / Carbonates / industrial waste / silciate |
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| Outline of Annual Research Achievements |
This research aims to develop a high-efficiency and low-cost CO2 mineralization process using recyclable chelating agents and industrial wastes/rocks at low to moderate temperatures.
In the first year of research, the excellent role of chelating agent on promoting CO2 mineralization was confirmed. Based on clarification of the effects of various conditions on mineral dissolution and carbonation, the system was optimized (Wang et al., J. Environ. Chem. Eng., 2022). Moreover, the special role of chelating agents on controlling Ca carbonates purity and morphologies was confirmed (Wang et al., Sci. Rep., 2021), which has great significance in making valuable products for industrial application.
However, the process still poses a challenge in terms of chemical costs, particularly for Na2CO3. This issue was addressed in the second year of research, during which the process was further developed to eliminate the need for chemical consumption during CO2 storage and significantly reduce costs. The feasibility of applying this process to various industrial wastes was also verified. Additionally, the possibility of using natural chelating agents such as amino acids and applying the process in underground rock reservoirs is currently under investigation, with preliminary results already published (Yoshioka et al., Front. Environ. Sci., 2022; Takahashi et al., Geochemics, 2023; Kikuchi et al., Front. Environ. Sci., 2022).
Finally, the removal of impurity metals from the recyling solution is being studied, and the results are expected to be applied in the near future.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The application of this system to various industrial wastes has been verified, and an advanced process has been proposed and tested, resulting in a significant reduction in chemical costs associated with CO2 storage. This system is expected to find application in a range of industries, such as the pole industrial and power plant sectors, which produce significant amounts of biomass ash. Furthermore, our investigations suggest that there may be potential for the recovery of rare earth elements during the CO2 storage process. Finally, the application of this system to underground rock reservoirs and applying natural chelating agent is also undergoing and obtained favourable results which have been published in several international journals.
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| Strategy for Future Research Activity |
In the final year of this research, our focus will be on addressing technical challenges that may impact the efficiency of Ca extraction and carbonation from the extraction solution, such as the removal of heavy metals or other impurity elements. Additionally, we will strive to further promote the industrial application of this system by establishing pilot or large-scale reactors. Lastly, we will continue to explore the potential application of this system in other research fields, including geothermal exploration, as well as the development of earth-scale systems, such as those utilizing coastal eco-systems.
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| Causes of Carryover |
前年度では新型コロナの影響で旅費の使用は予算より低かった。また、円安の影響により、論文の投稿資料が予算より高くなった。本年度では海外の国際学会に参加し、国内の学会に参加する予定も増えたため、旅費のが全年度より増加する。実験について、パイロットスケール反応システムの構築ため、器機の部品も購入必要がある。その他：学術論文の校閲料および学会参加費等。
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